Valve-reseating tool



M. B. SKINNER VA VE RESEATING TOOL June 10, 1930.

Filed Nov. 1924 WY FA M Fig. 1 is an Patented June 10, 1939 r Monrmnnas.sxmme,

or winmn rrn, ILLINOIS vALvE-nEsEATmG 'roon nt improvements relate totools forfresurfacing the seatsof valves. The

primefohject of'tlie invention is to increase the efficiency of. such;devices.

\is iinpro Patent No.

In the dr 3* In: some respects the presentoonstruetion vemeht upon thedevice of my 1,061,69 of May 13, 1913.

awings Figure 1 shows a globe valve in medial vertical section with my 3ld improved r es'uriacing tool partly broken awayapplied thereto; Fig. 2is aside view and Fig. 3,

is anend view of the cutter; eleyation ofthe upper bearing,

centering member or guide; Fig. 5 is an edge R is view of the lowerbearing member, pilot,

centering device or guide, Fig. sis a top view of the device of Fig. 5with a part 1 broken away to show construction and Fig.

7 isa fragmentary view of a part of Fig. 1

turned nine ty degrees. Valves of the general type illustrated areprovidedwithj an annular seat as 10 through 1 which there is a circularseat opening 11 on thedaxis of the valve stem when the valve 1 is.operatively asselhbled. The 1 mproved reseat ng t'ool comprises a shaft112 having a' "reduced and screw thread'ed pOrti'on'lB at its lower end,on whichpart 13-is threaded the; cutter 14 (of ing. member r an approvedrormyaad a cylindrical pilot member, centeringpiece or bearing 15occupying the seat opening 11. An upper bear 16 in the form of arelatively long truncated Cone and having screw threads thereonencompasses with nice fit the .sllaa 12,

. p ackmg may threaded parti s s M as valve, are

p upper portionof the shaft 12 is eiaereaand' y held securel tion.

One

in its desired operative posi feature of improvement resides inthreading the cutter as 14: and the centering device 15 directly uponthe threaded end of ii 1 the shaft, thus simplifying and reducing thenumber of parts and facilitating the assembling and separation of themin practice.

The upper centering member, guide or bearing 16 I practices in is animprovement over prior that it is provided witha taper- ;ana,whenappliedfeitherto the gland or bonnet 17, onto the interi- 5, 1924..serial" no. fmasesf This fine thread coupled with the slight 55" taperof the element makes for an unusually tight and strong fit between itand tlieb'oh-Q net 17, or between it and screw threads, for

instancethe threads 18"should the device he used without using thebonnet 17 as part of the supporting structure. Where' seen fiii'e screwthreads are thradedinto' a hole haw ing relatively coarse "screw threadstlie effect is very much. the same as though the rela tively coarsescrew thrleads were not present, and ishsubstantially the same as whenthe. v. member 16 is threaded intothe cylindrical hole at the top of thebonnet 17; According-1 1y an unusually strong support is provided forthe upper portion ofthe shaft 12.1

A third improvement is in the charaeter isticts of the loweringcentering member, pilot, or guide 15. In this connection it should beobserved that owing to shop prac: .tice in the manufacture of suchvalves the circular opening through, the diaphragm containingthe valveseat is found not to be of uniform diameter but variesin diameter insuch small amounts as from a sixtyk fourth to athirty-second of an inch,and nearly always smaller than it is supposed to be. Themanufacturers donot consider such variations in the size of the valve sea opening as llvital or important, but they become highly important in view of the de}siraloility of providing a centering element or snugly fitting pilot forsuch resurfacing tools adapted to bearupon the circular walls definingthe v'alve seat opening. Unless the pilot or bearing, as for instance15, fits the opening snugly the shaft as 12 is sustjeptihle ofvibrations detrimental to the result of a plane or smooth surfacedesired to reproduced .ontlie valve seat. Such looseness engenders achattering ofth'e cutter. inimical to the desired results. Suchchattering is substantially eliminated by a pilot which maintains aclose fit with the surrounding walls by resilient elements acti g asvihratiiih marten.

i :To; obtain the desired results I provide aj centering pieceior' pilotmelhber l5fhagving pluralitmj asfour, resilient elements at V marginaloortionsflthereof adaptedto pro-j ent member v a i outwal dlysp ingpressed Steel balls 17:31

like ind nmti neoi the netsl d' hg o pening fthe fec'essllS {after thejs ringand I 1 b lli plaged wifhln thejrecess, thus fiqnm iiigg aw;small-1annulei'llip vahout theopening 4 I the-i ecess, providing airedpbedj diameter Qfitlie recess gt the open.- 1

r et a i si i s and pe i ying g ehb i mg it er ebf 'ligldiii n:1i lfiis'h'0i1ld f be. exact w A 'n diameter .thelguide membei w uld therepfefitsmlg ly" and with the 'billSJ-illfgaging :tl ei eir'cular walldefining the valve If tlie v -alvefseat open l ref lu sti ated n,tl1isjes15ect1isitliat the bea iilg;

universal. joint.pfeyideclieit tlie tep of the shaft 12 between it,andllie' re'a dilyfrenibY- ,tligsoclget' or" recess 24; ,The}

the depth of th slo 25 ,is.

" spectively accommodated in cylindrical 6- cesses 187 aiid 'pressedbutwarclly by smel y H V co'iled springs 19 "fTdipl ejentithe;bztllsifoln;Oftlie shaft-12.4 1 .v e.

' [coming out of tl epecesses respecti ely-more s th an" to; fa smallextent Ifpress a s m'sill, ring .t

like ,pilotilfi i nede V Tdiameter}thanzfihat is; Y *slipposed to be;the "diz'i-meteii 'of i the Valves tppe ing at 1 IFQr stanceif he a v 1seat:openiiigfet 1 1' 'isisuppiosed Ito be'one "and. ope-half i'I1'ches?".il f diameter "the; Qise-like p i t l5 is made almostathirtysecond ofagil inch smaller in -diameter; The :oppsjitelyfdisposedballs lftvouldlin tliat instancepro i aniincltgerid the I 1,111ejvalte l eseatingt efietive rliam'eter-j'of -the; =pil0tr wolildflbeabo t, nd P ferab Y; utr fl re th r 61 eatepening, Sinee, it usuallyhaippenslhow ivefr'i; that'the seetf'openi ig et ll' isslightlysnfilaller tha nf it :iS v suppbsedr to 'be, when the eappl ed0i e,. h b s i "P s d; 11d thegdesired snug' lit-is JbbtaifiedI e tohave? he bells P oj s c y? i at if the valverseat opening"islslightlyk"er th'iii itisf suppbseolte be the desired slightly j beyojii d 1member ancl being ,A fourth feature qf im iioverfi nt is in the ;.ter t:

sable handbrace "23 'ffa gihentz'uily. {slibw mg -'i '-The lower end ofthe-brmeis pr'oizided with vaie ces's 6r: socket Mer dian, transverseslot 25 a lapted toacco r'nmbtlateltlie; cf0ss+pin 26 'igid in the shaft1-2.]k'lhe top f theishaftjgf 1 r ,j-11'2l-is rounded, as is also thiild 0 1"lio ttoina 0ft} f top of the shaft; 121391311615111 26 isfsuhifand i suchelso, that .7 when the parts are? bperatively I. assembledY thejc'losipini 26;;1 eszm iji es t again t the 1 '7 endi'wells 10f theslot 25," thus,,proy'idingv for g ockingflnqvements" of 'tlieiibrace invertical'a planes. passing} through, the .pin 2 6.. v Sine the socketionJi'ee'ss '24j-is"of 'a materially greater diameteffthii' isiithe tbpp 'ol tionlofl" I the shaft edditiqiieljgrbbking; mQVen ents ve 11v isal jdintfis rplfqvided rwhefebyi the so'cket ehd j .dfthe'bracemayswingfaround freely on top f f This feitufe' is impbr 'infVieW oft he fact that the opeiateriiis seldom sufficiently V;skilled',rer1the1plige hgrehe has; td work; is

-11 sl entlyble wt" H fltlie shaft and: (gutter bykfgitcesl glipected'con-i 5 ,Qentric iivith the 1 shaft, "afid ,thiis] it-heishaft l isnicked: slightly, drf at least undesirable strains are appliedto pgtrt'desired I to' -be E "enable ihim t0rotate.

mainteiliedflin their" truly' daxial ii-elation;

in specifically illustrated'tr dldeselibed es'fall i within'the scopeefthegaipgiemlecl{claims I claim: i

her de d foffeiv lii m fir'ilng a 'cllrularrseat open ng,

ingf oftlie Valve.

2. A pilot dev iY lve" --'1ieseeting 1' i611; a v disc-like" I yr'aditlholesextendingfi wa d m I if spring and fa I 51 3 1 in 1GB of {Saidholes en angd h y 1, e: be ia'r ii p -p ess d u wardly, sa

tign of a; c tter; ean?s 1for:mmimg?thegfcut-j fte'r,fj and acylindrical 'pilot' nimher having balls serving} asgbearings et] edge]portions w fther'ef, said :balls -"being mo fl ntecl fO fl-"in's Waicland butwerdin levirientfaiiidbeing pro-.-; l Lvided respectively with.-s'pii iig's pressing bells'inbrmtlly' pitoject-I a p edixtd-e age; L QYQ" 11 01 fh gwllrde li ng hes tipp n;

heles. lfespectively'ghaying 1a? reduced diameg s ibpenihgfth'ereqffgwhereby said ballstm' p o eet butgslightly beyondthe} a uperipllery of'the disc-like; member; P

